![Thomas Pedersen](/assets/img/avatar_default.png)
This refactoring fixes a "scheduling while atomic" warning when allocating a mesh station entry while holding the RCU read lock. Fix this by creating a new function mesh_sta_info_get(), which correctly handles the locking and returns under RCU. Also move some unnecessarily #ifdefed mesh station init code from sta_info_alloc() to __mesh_sta_info_alloc(). Signed-off-by: Thomas Pedersen <thomas@cozybit.com> [change code flow to make sparse happy] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
1503 lines
38 KiB
C
1503 lines
38 KiB
C
/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/etherdevice.h>
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/timer.h>
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#include <linux/rtnetlink.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "rate.h"
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#include "sta_info.h"
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#include "debugfs_sta.h"
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#include "mesh.h"
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#include "wme.h"
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/**
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* DOC: STA information lifetime rules
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*
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* STA info structures (&struct sta_info) are managed in a hash table
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* for faster lookup and a list for iteration. They are managed using
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* RCU, i.e. access to the list and hash table is protected by RCU.
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*
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* Upon allocating a STA info structure with sta_info_alloc(), the caller
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* owns that structure. It must then insert it into the hash table using
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* either sta_info_insert() or sta_info_insert_rcu(); only in the latter
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* case (which acquires an rcu read section but must not be called from
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* within one) will the pointer still be valid after the call. Note that
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* the caller may not do much with the STA info before inserting it, in
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* particular, it may not start any mesh peer link management or add
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* encryption keys.
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*
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* When the insertion fails (sta_info_insert()) returns non-zero), the
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* structure will have been freed by sta_info_insert()!
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*
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* Station entries are added by mac80211 when you establish a link with a
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* peer. This means different things for the different type of interfaces
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* we support. For a regular station this mean we add the AP sta when we
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* receive an association response from the AP. For IBSS this occurs when
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* get to know about a peer on the same IBSS. For WDS we add the sta for
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* the peer immediately upon device open. When using AP mode we add stations
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* for each respective station upon request from userspace through nl80211.
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*
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* In order to remove a STA info structure, various sta_info_destroy_*()
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* calls are available.
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*
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* There is no concept of ownership on a STA entry, each structure is
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* owned by the global hash table/list until it is removed. All users of
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* the structure need to be RCU protected so that the structure won't be
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* freed before they are done using it.
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*/
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/* Caller must hold local->sta_mtx */
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static int sta_info_hash_del(struct ieee80211_local *local,
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struct sta_info *sta)
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{
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struct sta_info *s;
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s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
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lockdep_is_held(&local->sta_mtx));
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if (!s)
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return -ENOENT;
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if (s == sta) {
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rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
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s->hnext);
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return 0;
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}
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while (rcu_access_pointer(s->hnext) &&
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rcu_access_pointer(s->hnext) != sta)
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s = rcu_dereference_protected(s->hnext,
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lockdep_is_held(&local->sta_mtx));
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if (rcu_access_pointer(s->hnext)) {
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rcu_assign_pointer(s->hnext, sta->hnext);
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return 0;
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}
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return -ENOENT;
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}
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static void cleanup_single_sta(struct sta_info *sta)
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{
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int ac, i;
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struct tid_ampdu_tx *tid_tx;
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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struct ieee80211_local *local = sdata->local;
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struct ps_data *ps;
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/*
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* At this point, when being called as call_rcu callback,
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* neither mac80211 nor the driver can reference this
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* sta struct any more except by still existing timers
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* associated with this station that we clean up below.
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*
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* Note though that this still uses the sdata and even
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* calls the driver in AP and mesh mode, so interfaces
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* of those types mush use call sta_info_flush_cleanup()
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* (typically via sta_info_flush()) before deconfiguring
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* the driver.
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*
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* In station mode, nothing happens here so it doesn't
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* have to (and doesn't) do that, this is intentional to
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* speed up roaming.
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*/
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if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
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if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
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sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
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ps = &sdata->bss->ps;
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else
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return;
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clear_sta_flag(sta, WLAN_STA_PS_STA);
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atomic_dec(&ps->num_sta_ps);
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sta_info_recalc_tim(sta);
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}
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for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
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local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
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ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
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ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
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}
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#ifdef CONFIG_MAC80211_MESH
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if (ieee80211_vif_is_mesh(&sdata->vif)) {
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mesh_accept_plinks_update(sdata);
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mesh_plink_deactivate(sta);
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del_timer_sync(&sta->plink_timer);
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}
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#endif
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cancel_work_sync(&sta->drv_unblock_wk);
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/*
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* Destroy aggregation state here. It would be nice to wait for the
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* driver to finish aggregation stop and then clean up, but for now
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* drivers have to handle aggregation stop being requested, followed
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* directly by station destruction.
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*/
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for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
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tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
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if (!tid_tx)
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continue;
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ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
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kfree(tid_tx);
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}
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sta_info_free(local, sta);
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}
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void ieee80211_cleanup_sdata_stas(struct ieee80211_sub_if_data *sdata)
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{
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struct sta_info *sta;
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spin_lock_bh(&sdata->cleanup_stations_lock);
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while (!list_empty(&sdata->cleanup_stations)) {
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sta = list_first_entry(&sdata->cleanup_stations,
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struct sta_info, list);
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list_del(&sta->list);
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spin_unlock_bh(&sdata->cleanup_stations_lock);
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cleanup_single_sta(sta);
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spin_lock_bh(&sdata->cleanup_stations_lock);
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}
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spin_unlock_bh(&sdata->cleanup_stations_lock);
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}
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static void free_sta_rcu(struct rcu_head *h)
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{
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struct sta_info *sta = container_of(h, struct sta_info, rcu_head);
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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spin_lock(&sdata->cleanup_stations_lock);
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list_add_tail(&sta->list, &sdata->cleanup_stations);
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spin_unlock(&sdata->cleanup_stations_lock);
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ieee80211_queue_work(&sdata->local->hw, &sdata->cleanup_stations_wk);
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}
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/* protected by RCU */
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struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
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const u8 *addr)
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{
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta;
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sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
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lockdep_is_held(&local->sta_mtx));
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while (sta) {
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if (sta->sdata == sdata &&
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ether_addr_equal(sta->sta.addr, addr))
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break;
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sta = rcu_dereference_check(sta->hnext,
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lockdep_is_held(&local->sta_mtx));
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}
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return sta;
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}
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/*
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* Get sta info either from the specified interface
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* or from one of its vlans
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*/
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struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
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const u8 *addr)
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{
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta;
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sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
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lockdep_is_held(&local->sta_mtx));
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while (sta) {
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if ((sta->sdata == sdata ||
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(sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
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ether_addr_equal(sta->sta.addr, addr))
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break;
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sta = rcu_dereference_check(sta->hnext,
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lockdep_is_held(&local->sta_mtx));
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}
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return sta;
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}
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struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
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int idx)
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{
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta;
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int i = 0;
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list_for_each_entry_rcu(sta, &local->sta_list, list) {
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if (sdata != sta->sdata)
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continue;
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if (i < idx) {
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++i;
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continue;
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}
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return sta;
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}
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return NULL;
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}
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/**
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* sta_info_free - free STA
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*
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* @local: pointer to the global information
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* @sta: STA info to free
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*
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* This function must undo everything done by sta_info_alloc()
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* that may happen before sta_info_insert(). It may only be
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* called when sta_info_insert() has not been attempted (and
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* if that fails, the station is freed anyway.)
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*/
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void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
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{
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if (sta->rate_ctrl)
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rate_control_free_sta(sta);
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sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
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kfree(sta);
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}
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/* Caller must hold local->sta_mtx */
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static void sta_info_hash_add(struct ieee80211_local *local,
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struct sta_info *sta)
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{
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lockdep_assert_held(&local->sta_mtx);
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sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
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rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
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}
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static void sta_unblock(struct work_struct *wk)
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{
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struct sta_info *sta;
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sta = container_of(wk, struct sta_info, drv_unblock_wk);
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if (sta->dead)
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return;
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if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
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local_bh_disable();
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ieee80211_sta_ps_deliver_wakeup(sta);
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local_bh_enable();
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} else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
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clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
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local_bh_disable();
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ieee80211_sta_ps_deliver_poll_response(sta);
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local_bh_enable();
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} else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
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clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
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local_bh_disable();
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ieee80211_sta_ps_deliver_uapsd(sta);
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local_bh_enable();
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} else
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clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
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}
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static int sta_prepare_rate_control(struct ieee80211_local *local,
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struct sta_info *sta, gfp_t gfp)
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{
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if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
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return 0;
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sta->rate_ctrl = local->rate_ctrl;
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sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
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&sta->sta, gfp);
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if (!sta->rate_ctrl_priv)
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return -ENOMEM;
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return 0;
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}
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struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
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const u8 *addr, gfp_t gfp)
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{
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta;
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struct timespec uptime;
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int i;
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sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
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if (!sta)
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return NULL;
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spin_lock_init(&sta->lock);
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INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
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INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
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mutex_init(&sta->ampdu_mlme.mtx);
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memcpy(sta->sta.addr, addr, ETH_ALEN);
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sta->local = local;
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sta->sdata = sdata;
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sta->last_rx = jiffies;
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sta->sta_state = IEEE80211_STA_NONE;
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do_posix_clock_monotonic_gettime(&uptime);
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sta->last_connected = uptime.tv_sec;
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ewma_init(&sta->avg_signal, 1024, 8);
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if (sta_prepare_rate_control(local, sta, gfp)) {
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kfree(sta);
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return NULL;
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}
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for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
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/*
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* timer_to_tid must be initialized with identity mapping
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* to enable session_timer's data differentiation. See
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* sta_rx_agg_session_timer_expired for usage.
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*/
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sta->timer_to_tid[i] = i;
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}
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for (i = 0; i < IEEE80211_NUM_ACS; i++) {
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skb_queue_head_init(&sta->ps_tx_buf[i]);
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skb_queue_head_init(&sta->tx_filtered[i]);
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}
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for (i = 0; i < IEEE80211_NUM_TIDS; i++)
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sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
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sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
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return sta;
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}
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static int sta_info_insert_check(struct sta_info *sta)
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{
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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/*
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* Can't be a WARN_ON because it can be triggered through a race:
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* something inserts a STA (on one CPU) without holding the RTNL
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* and another CPU turns off the net device.
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*/
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if (unlikely(!ieee80211_sdata_running(sdata)))
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return -ENETDOWN;
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if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
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is_multicast_ether_addr(sta->sta.addr)))
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return -EINVAL;
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return 0;
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}
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static int sta_info_insert_drv_state(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *sdata,
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struct sta_info *sta)
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{
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enum ieee80211_sta_state state;
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int err = 0;
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for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
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err = drv_sta_state(local, sdata, sta, state, state + 1);
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if (err)
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break;
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}
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if (!err) {
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/*
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* Drivers using legacy sta_add/sta_remove callbacks only
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* get uploaded set to true after sta_add is called.
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*/
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if (!local->ops->sta_add)
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sta->uploaded = true;
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return 0;
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}
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if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
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sdata_info(sdata,
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"failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
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sta->sta.addr, state + 1, err);
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err = 0;
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}
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/* unwind on error */
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for (; state > IEEE80211_STA_NOTEXIST; state--)
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WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
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return err;
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}
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/*
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* should be called with sta_mtx locked
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* this function replaces the mutex lock
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* with a RCU lock
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*/
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static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
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{
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struct ieee80211_local *local = sta->local;
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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struct station_info sinfo;
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int err = 0;
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lockdep_assert_held(&local->sta_mtx);
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/* check if STA exists already */
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if (sta_info_get_bss(sdata, sta->sta.addr)) {
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err = -EEXIST;
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goto out_err;
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}
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/* notify driver */
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err = sta_info_insert_drv_state(local, sdata, sta);
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if (err)
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goto out_err;
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local->num_sta++;
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local->sta_generation++;
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smp_mb();
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/* make the station visible */
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sta_info_hash_add(local, sta);
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list_add_rcu(&sta->list, &local->sta_list);
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set_sta_flag(sta, WLAN_STA_INSERTED);
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ieee80211_sta_debugfs_add(sta);
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rate_control_add_sta_debugfs(sta);
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memset(&sinfo, 0, sizeof(sinfo));
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sinfo.filled = 0;
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sinfo.generation = local->sta_generation;
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cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
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sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
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/* move reference to rcu-protected */
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|
rcu_read_lock();
|
|
mutex_unlock(&local->sta_mtx);
|
|
|
|
if (ieee80211_vif_is_mesh(&sdata->vif))
|
|
mesh_accept_plinks_update(sdata);
|
|
|
|
return 0;
|
|
out_err:
|
|
mutex_unlock(&local->sta_mtx);
|
|
rcu_read_lock();
|
|
return err;
|
|
}
|
|
|
|
int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
|
|
{
|
|
struct ieee80211_local *local = sta->local;
|
|
int err = 0;
|
|
|
|
might_sleep();
|
|
|
|
err = sta_info_insert_check(sta);
|
|
if (err) {
|
|
rcu_read_lock();
|
|
goto out_free;
|
|
}
|
|
|
|
mutex_lock(&local->sta_mtx);
|
|
|
|
err = sta_info_insert_finish(sta);
|
|
if (err)
|
|
goto out_free;
|
|
|
|
return 0;
|
|
out_free:
|
|
BUG_ON(!err);
|
|
sta_info_free(local, sta);
|
|
return err;
|
|
}
|
|
|
|
int sta_info_insert(struct sta_info *sta)
|
|
{
|
|
int err = sta_info_insert_rcu(sta);
|
|
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline void __bss_tim_set(u8 *tim, u16 id)
|
|
{
|
|
/*
|
|
* This format has been mandated by the IEEE specifications,
|
|
* so this line may not be changed to use the __set_bit() format.
|
|
*/
|
|
tim[id / 8] |= (1 << (id % 8));
|
|
}
|
|
|
|
static inline void __bss_tim_clear(u8 *tim, u16 id)
|
|
{
|
|
/*
|
|
* This format has been mandated by the IEEE specifications,
|
|
* so this line may not be changed to use the __clear_bit() format.
|
|
*/
|
|
tim[id / 8] &= ~(1 << (id % 8));
|
|
}
|
|
|
|
static unsigned long ieee80211_tids_for_ac(int ac)
|
|
{
|
|
/* If we ever support TIDs > 7, this obviously needs to be adjusted */
|
|
switch (ac) {
|
|
case IEEE80211_AC_VO:
|
|
return BIT(6) | BIT(7);
|
|
case IEEE80211_AC_VI:
|
|
return BIT(4) | BIT(5);
|
|
case IEEE80211_AC_BE:
|
|
return BIT(0) | BIT(3);
|
|
case IEEE80211_AC_BK:
|
|
return BIT(1) | BIT(2);
|
|
default:
|
|
WARN_ON(1);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
void sta_info_recalc_tim(struct sta_info *sta)
|
|
{
|
|
struct ieee80211_local *local = sta->local;
|
|
struct ps_data *ps;
|
|
unsigned long flags;
|
|
bool indicate_tim = false;
|
|
u8 ignore_for_tim = sta->sta.uapsd_queues;
|
|
int ac;
|
|
u16 id;
|
|
|
|
if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
|
|
sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
|
|
if (WARN_ON_ONCE(!sta->sdata->bss))
|
|
return;
|
|
|
|
ps = &sta->sdata->bss->ps;
|
|
id = sta->sta.aid;
|
|
} else {
|
|
return;
|
|
}
|
|
|
|
/* No need to do anything if the driver does all */
|
|
if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
|
|
return;
|
|
|
|
if (sta->dead)
|
|
goto done;
|
|
|
|
/*
|
|
* If all ACs are delivery-enabled then we should build
|
|
* the TIM bit for all ACs anyway; if only some are then
|
|
* we ignore those and build the TIM bit using only the
|
|
* non-enabled ones.
|
|
*/
|
|
if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
|
|
ignore_for_tim = 0;
|
|
|
|
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
|
|
unsigned long tids;
|
|
|
|
if (ignore_for_tim & BIT(ac))
|
|
continue;
|
|
|
|
indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
|
|
!skb_queue_empty(&sta->ps_tx_buf[ac]);
|
|
if (indicate_tim)
|
|
break;
|
|
|
|
tids = ieee80211_tids_for_ac(ac);
|
|
|
|
indicate_tim |=
|
|
sta->driver_buffered_tids & tids;
|
|
}
|
|
|
|
done:
|
|
spin_lock_irqsave(&local->tim_lock, flags);
|
|
|
|
if (indicate_tim)
|
|
__bss_tim_set(ps->tim, id);
|
|
else
|
|
__bss_tim_clear(ps->tim, id);
|
|
|
|
if (local->ops->set_tim) {
|
|
local->tim_in_locked_section = true;
|
|
drv_set_tim(local, &sta->sta, indicate_tim);
|
|
local->tim_in_locked_section = false;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&local->tim_lock, flags);
|
|
}
|
|
|
|
static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
|
|
{
|
|
struct ieee80211_tx_info *info;
|
|
int timeout;
|
|
|
|
if (!skb)
|
|
return false;
|
|
|
|
info = IEEE80211_SKB_CB(skb);
|
|
|
|
/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
|
|
timeout = (sta->listen_interval *
|
|
sta->sdata->vif.bss_conf.beacon_int *
|
|
32 / 15625) * HZ;
|
|
if (timeout < STA_TX_BUFFER_EXPIRE)
|
|
timeout = STA_TX_BUFFER_EXPIRE;
|
|
return time_after(jiffies, info->control.jiffies + timeout);
|
|
}
|
|
|
|
|
|
static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
|
|
struct sta_info *sta, int ac)
|
|
{
|
|
unsigned long flags;
|
|
struct sk_buff *skb;
|
|
|
|
/*
|
|
* First check for frames that should expire on the filtered
|
|
* queue. Frames here were rejected by the driver and are on
|
|
* a separate queue to avoid reordering with normal PS-buffered
|
|
* frames. They also aren't accounted for right now in the
|
|
* total_ps_buffered counter.
|
|
*/
|
|
for (;;) {
|
|
spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
|
|
skb = skb_peek(&sta->tx_filtered[ac]);
|
|
if (sta_info_buffer_expired(sta, skb))
|
|
skb = __skb_dequeue(&sta->tx_filtered[ac]);
|
|
else
|
|
skb = NULL;
|
|
spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
|
|
|
|
/*
|
|
* Frames are queued in order, so if this one
|
|
* hasn't expired yet we can stop testing. If
|
|
* we actually reached the end of the queue we
|
|
* also need to stop, of course.
|
|
*/
|
|
if (!skb)
|
|
break;
|
|
ieee80211_free_txskb(&local->hw, skb);
|
|
}
|
|
|
|
/*
|
|
* Now also check the normal PS-buffered queue, this will
|
|
* only find something if the filtered queue was emptied
|
|
* since the filtered frames are all before the normal PS
|
|
* buffered frames.
|
|
*/
|
|
for (;;) {
|
|
spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
|
|
skb = skb_peek(&sta->ps_tx_buf[ac]);
|
|
if (sta_info_buffer_expired(sta, skb))
|
|
skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
|
|
else
|
|
skb = NULL;
|
|
spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
|
|
|
|
/*
|
|
* frames are queued in order, so if this one
|
|
* hasn't expired yet (or we reached the end of
|
|
* the queue) we can stop testing
|
|
*/
|
|
if (!skb)
|
|
break;
|
|
|
|
local->total_ps_buffered--;
|
|
ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
|
|
sta->sta.addr);
|
|
ieee80211_free_txskb(&local->hw, skb);
|
|
}
|
|
|
|
/*
|
|
* Finally, recalculate the TIM bit for this station -- it might
|
|
* now be clear because the station was too slow to retrieve its
|
|
* frames.
|
|
*/
|
|
sta_info_recalc_tim(sta);
|
|
|
|
/*
|
|
* Return whether there are any frames still buffered, this is
|
|
* used to check whether the cleanup timer still needs to run,
|
|
* if there are no frames we don't need to rearm the timer.
|
|
*/
|
|
return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
|
|
skb_queue_empty(&sta->tx_filtered[ac]));
|
|
}
|
|
|
|
static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
|
|
struct sta_info *sta)
|
|
{
|
|
bool have_buffered = false;
|
|
int ac;
|
|
|
|
/* This is only necessary for stations on BSS interfaces */
|
|
if (!sta->sdata->bss)
|
|
return false;
|
|
|
|
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
|
|
have_buffered |=
|
|
sta_info_cleanup_expire_buffered_ac(local, sta, ac);
|
|
|
|
return have_buffered;
|
|
}
|
|
|
|
int __must_check __sta_info_destroy(struct sta_info *sta)
|
|
{
|
|
struct ieee80211_local *local;
|
|
struct ieee80211_sub_if_data *sdata;
|
|
int ret, i;
|
|
|
|
might_sleep();
|
|
|
|
if (!sta)
|
|
return -ENOENT;
|
|
|
|
local = sta->local;
|
|
sdata = sta->sdata;
|
|
|
|
lockdep_assert_held(&local->sta_mtx);
|
|
|
|
/*
|
|
* Before removing the station from the driver and
|
|
* rate control, it might still start new aggregation
|
|
* sessions -- block that to make sure the tear-down
|
|
* will be sufficient.
|
|
*/
|
|
set_sta_flag(sta, WLAN_STA_BLOCK_BA);
|
|
ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
|
|
|
|
ret = sta_info_hash_del(local, sta);
|
|
if (ret)
|
|
return ret;
|
|
|
|
list_del_rcu(&sta->list);
|
|
|
|
mutex_lock(&local->key_mtx);
|
|
for (i = 0; i < NUM_DEFAULT_KEYS; i++)
|
|
__ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
|
|
if (sta->ptk)
|
|
__ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
|
|
mutex_unlock(&local->key_mtx);
|
|
|
|
sta->dead = true;
|
|
|
|
local->num_sta--;
|
|
local->sta_generation++;
|
|
|
|
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
|
|
RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
|
|
|
|
while (sta->sta_state > IEEE80211_STA_NONE) {
|
|
ret = sta_info_move_state(sta, sta->sta_state - 1);
|
|
if (ret) {
|
|
WARN_ON_ONCE(1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (sta->uploaded) {
|
|
ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
|
|
IEEE80211_STA_NOTEXIST);
|
|
WARN_ON_ONCE(ret != 0);
|
|
}
|
|
|
|
sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
|
|
|
|
cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
|
|
|
|
rate_control_remove_sta_debugfs(sta);
|
|
ieee80211_sta_debugfs_remove(sta);
|
|
|
|
call_rcu(&sta->rcu_head, free_sta_rcu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
|
|
{
|
|
struct sta_info *sta;
|
|
int ret;
|
|
|
|
mutex_lock(&sdata->local->sta_mtx);
|
|
sta = sta_info_get(sdata, addr);
|
|
ret = __sta_info_destroy(sta);
|
|
mutex_unlock(&sdata->local->sta_mtx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
|
|
const u8 *addr)
|
|
{
|
|
struct sta_info *sta;
|
|
int ret;
|
|
|
|
mutex_lock(&sdata->local->sta_mtx);
|
|
sta = sta_info_get_bss(sdata, addr);
|
|
ret = __sta_info_destroy(sta);
|
|
mutex_unlock(&sdata->local->sta_mtx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void sta_info_cleanup(unsigned long data)
|
|
{
|
|
struct ieee80211_local *local = (struct ieee80211_local *) data;
|
|
struct sta_info *sta;
|
|
bool timer_needed = false;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(sta, &local->sta_list, list)
|
|
if (sta_info_cleanup_expire_buffered(local, sta))
|
|
timer_needed = true;
|
|
rcu_read_unlock();
|
|
|
|
if (local->quiescing)
|
|
return;
|
|
|
|
if (!timer_needed)
|
|
return;
|
|
|
|
mod_timer(&local->sta_cleanup,
|
|
round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
|
|
}
|
|
|
|
void sta_info_init(struct ieee80211_local *local)
|
|
{
|
|
spin_lock_init(&local->tim_lock);
|
|
mutex_init(&local->sta_mtx);
|
|
INIT_LIST_HEAD(&local->sta_list);
|
|
|
|
setup_timer(&local->sta_cleanup, sta_info_cleanup,
|
|
(unsigned long)local);
|
|
}
|
|
|
|
void sta_info_stop(struct ieee80211_local *local)
|
|
{
|
|
del_timer_sync(&local->sta_cleanup);
|
|
}
|
|
|
|
|
|
int sta_info_flush_defer(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sta_info *sta, *tmp;
|
|
int ret = 0;
|
|
|
|
might_sleep();
|
|
|
|
mutex_lock(&local->sta_mtx);
|
|
list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
|
|
if (sdata == sta->sdata) {
|
|
WARN_ON(__sta_info_destroy(sta));
|
|
ret++;
|
|
}
|
|
}
|
|
mutex_unlock(&local->sta_mtx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void sta_info_flush_cleanup(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
ieee80211_cleanup_sdata_stas(sdata);
|
|
cancel_work_sync(&sdata->cleanup_stations_wk);
|
|
}
|
|
|
|
void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
|
|
unsigned long exp_time)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sta_info *sta, *tmp;
|
|
|
|
mutex_lock(&local->sta_mtx);
|
|
|
|
list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
|
|
if (sdata != sta->sdata)
|
|
continue;
|
|
|
|
if (time_after(jiffies, sta->last_rx + exp_time)) {
|
|
sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
|
|
sta->sta.addr);
|
|
WARN_ON(__sta_info_destroy(sta));
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&local->sta_mtx);
|
|
}
|
|
|
|
struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
|
|
const u8 *addr,
|
|
const u8 *localaddr)
|
|
{
|
|
struct sta_info *sta, *nxt;
|
|
|
|
/*
|
|
* Just return a random station if localaddr is NULL
|
|
* ... first in list.
|
|
*/
|
|
for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
|
|
if (localaddr &&
|
|
!ether_addr_equal(sta->sdata->vif.addr, localaddr))
|
|
continue;
|
|
if (!sta->uploaded)
|
|
return NULL;
|
|
return &sta->sta;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
|
|
|
|
struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
|
|
const u8 *addr)
|
|
{
|
|
struct sta_info *sta;
|
|
|
|
if (!vif)
|
|
return NULL;
|
|
|
|
sta = sta_info_get_bss(vif_to_sdata(vif), addr);
|
|
if (!sta)
|
|
return NULL;
|
|
|
|
if (!sta->uploaded)
|
|
return NULL;
|
|
|
|
return &sta->sta;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_find_sta);
|
|
|
|
static void clear_sta_ps_flags(void *_sta)
|
|
{
|
|
struct sta_info *sta = _sta;
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
struct ps_data *ps;
|
|
|
|
if (sdata->vif.type == NL80211_IFTYPE_AP ||
|
|
sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
|
|
ps = &sdata->bss->ps;
|
|
else
|
|
return;
|
|
|
|
clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
|
|
if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
|
|
atomic_dec(&ps->num_sta_ps);
|
|
}
|
|
|
|
/* powersave support code */
|
|
void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sk_buff_head pending;
|
|
int filtered = 0, buffered = 0, ac;
|
|
unsigned long flags;
|
|
|
|
clear_sta_flag(sta, WLAN_STA_SP);
|
|
|
|
BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
|
|
sta->driver_buffered_tids = 0;
|
|
|
|
if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
|
|
drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
|
|
|
|
skb_queue_head_init(&pending);
|
|
|
|
/* Send all buffered frames to the station */
|
|
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
|
|
int count = skb_queue_len(&pending), tmp;
|
|
|
|
spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
|
|
skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
|
|
spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
|
|
tmp = skb_queue_len(&pending);
|
|
filtered += tmp - count;
|
|
count = tmp;
|
|
|
|
spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
|
|
skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
|
|
spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
|
|
tmp = skb_queue_len(&pending);
|
|
buffered += tmp - count;
|
|
}
|
|
|
|
ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
|
|
|
|
local->total_ps_buffered -= buffered;
|
|
|
|
sta_info_recalc_tim(sta);
|
|
|
|
ps_dbg(sdata,
|
|
"STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
|
|
sta->sta.addr, sta->sta.aid, filtered, buffered);
|
|
}
|
|
|
|
static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
|
|
struct sta_info *sta, int tid,
|
|
enum ieee80211_frame_release_type reason)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct ieee80211_qos_hdr *nullfunc;
|
|
struct sk_buff *skb;
|
|
int size = sizeof(*nullfunc);
|
|
__le16 fc;
|
|
bool qos = test_sta_flag(sta, WLAN_STA_WME);
|
|
struct ieee80211_tx_info *info;
|
|
struct ieee80211_chanctx_conf *chanctx_conf;
|
|
|
|
if (qos) {
|
|
fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
|
|
IEEE80211_STYPE_QOS_NULLFUNC |
|
|
IEEE80211_FCTL_FROMDS);
|
|
} else {
|
|
size -= 2;
|
|
fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
|
|
IEEE80211_STYPE_NULLFUNC |
|
|
IEEE80211_FCTL_FROMDS);
|
|
}
|
|
|
|
skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
|
|
if (!skb)
|
|
return;
|
|
|
|
skb_reserve(skb, local->hw.extra_tx_headroom);
|
|
|
|
nullfunc = (void *) skb_put(skb, size);
|
|
nullfunc->frame_control = fc;
|
|
nullfunc->duration_id = 0;
|
|
memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
|
|
memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
|
|
memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
|
|
|
|
skb->priority = tid;
|
|
skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
|
|
if (qos) {
|
|
nullfunc->qos_ctrl = cpu_to_le16(tid);
|
|
|
|
if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
|
|
nullfunc->qos_ctrl |=
|
|
cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
|
|
}
|
|
|
|
info = IEEE80211_SKB_CB(skb);
|
|
|
|
/*
|
|
* Tell TX path to send this frame even though the
|
|
* STA may still remain is PS mode after this frame
|
|
* exchange. Also set EOSP to indicate this packet
|
|
* ends the poll/service period.
|
|
*/
|
|
info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
|
|
IEEE80211_TX_STATUS_EOSP |
|
|
IEEE80211_TX_CTL_REQ_TX_STATUS;
|
|
|
|
drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
|
|
|
|
rcu_read_lock();
|
|
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
|
|
if (WARN_ON(!chanctx_conf)) {
|
|
rcu_read_unlock();
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
|
|
ieee80211_xmit(sdata, skb, chanctx_conf->def.chan->band);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void
|
|
ieee80211_sta_ps_deliver_response(struct sta_info *sta,
|
|
int n_frames, u8 ignored_acs,
|
|
enum ieee80211_frame_release_type reason)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
struct ieee80211_local *local = sdata->local;
|
|
bool found = false;
|
|
bool more_data = false;
|
|
int ac;
|
|
unsigned long driver_release_tids = 0;
|
|
struct sk_buff_head frames;
|
|
|
|
/* Service or PS-Poll period starts */
|
|
set_sta_flag(sta, WLAN_STA_SP);
|
|
|
|
__skb_queue_head_init(&frames);
|
|
|
|
/*
|
|
* Get response frame(s) and more data bit for it.
|
|
*/
|
|
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
|
|
unsigned long tids;
|
|
|
|
if (ignored_acs & BIT(ac))
|
|
continue;
|
|
|
|
tids = ieee80211_tids_for_ac(ac);
|
|
|
|
if (!found) {
|
|
driver_release_tids = sta->driver_buffered_tids & tids;
|
|
if (driver_release_tids) {
|
|
found = true;
|
|
} else {
|
|
struct sk_buff *skb;
|
|
|
|
while (n_frames > 0) {
|
|
skb = skb_dequeue(&sta->tx_filtered[ac]);
|
|
if (!skb) {
|
|
skb = skb_dequeue(
|
|
&sta->ps_tx_buf[ac]);
|
|
if (skb)
|
|
local->total_ps_buffered--;
|
|
}
|
|
if (!skb)
|
|
break;
|
|
n_frames--;
|
|
found = true;
|
|
__skb_queue_tail(&frames, skb);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If the driver has data on more than one TID then
|
|
* certainly there's more data if we release just a
|
|
* single frame now (from a single TID).
|
|
*/
|
|
if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
|
|
hweight16(driver_release_tids) > 1) {
|
|
more_data = true;
|
|
driver_release_tids =
|
|
BIT(ffs(driver_release_tids) - 1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
|
|
!skb_queue_empty(&sta->ps_tx_buf[ac])) {
|
|
more_data = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
int tid;
|
|
|
|
/*
|
|
* For PS-Poll, this can only happen due to a race condition
|
|
* when we set the TIM bit and the station notices it, but
|
|
* before it can poll for the frame we expire it.
|
|
*
|
|
* For uAPSD, this is said in the standard (11.2.1.5 h):
|
|
* At each unscheduled SP for a non-AP STA, the AP shall
|
|
* attempt to transmit at least one MSDU or MMPDU, but no
|
|
* more than the value specified in the Max SP Length field
|
|
* in the QoS Capability element from delivery-enabled ACs,
|
|
* that are destined for the non-AP STA.
|
|
*
|
|
* Since we have no other MSDU/MMPDU, transmit a QoS null frame.
|
|
*/
|
|
|
|
/* This will evaluate to 1, 3, 5 or 7. */
|
|
tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
|
|
|
|
ieee80211_send_null_response(sdata, sta, tid, reason);
|
|
return;
|
|
}
|
|
|
|
if (!driver_release_tids) {
|
|
struct sk_buff_head pending;
|
|
struct sk_buff *skb;
|
|
int num = 0;
|
|
u16 tids = 0;
|
|
|
|
skb_queue_head_init(&pending);
|
|
|
|
while ((skb = __skb_dequeue(&frames))) {
|
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
|
struct ieee80211_hdr *hdr = (void *) skb->data;
|
|
u8 *qoshdr = NULL;
|
|
|
|
num++;
|
|
|
|
/*
|
|
* Tell TX path to send this frame even though the
|
|
* STA may still remain is PS mode after this frame
|
|
* exchange.
|
|
*/
|
|
info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
|
|
|
|
/*
|
|
* Use MoreData flag to indicate whether there are
|
|
* more buffered frames for this STA
|
|
*/
|
|
if (more_data || !skb_queue_empty(&frames))
|
|
hdr->frame_control |=
|
|
cpu_to_le16(IEEE80211_FCTL_MOREDATA);
|
|
else
|
|
hdr->frame_control &=
|
|
cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
|
|
|
|
if (ieee80211_is_data_qos(hdr->frame_control) ||
|
|
ieee80211_is_qos_nullfunc(hdr->frame_control))
|
|
qoshdr = ieee80211_get_qos_ctl(hdr);
|
|
|
|
/* end service period after last frame */
|
|
if (skb_queue_empty(&frames)) {
|
|
if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
|
|
qoshdr)
|
|
*qoshdr |= IEEE80211_QOS_CTL_EOSP;
|
|
|
|
info->flags |= IEEE80211_TX_STATUS_EOSP |
|
|
IEEE80211_TX_CTL_REQ_TX_STATUS;
|
|
}
|
|
|
|
if (qoshdr)
|
|
tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
|
|
else
|
|
tids |= BIT(0);
|
|
|
|
__skb_queue_tail(&pending, skb);
|
|
}
|
|
|
|
drv_allow_buffered_frames(local, sta, tids, num,
|
|
reason, more_data);
|
|
|
|
ieee80211_add_pending_skbs(local, &pending);
|
|
|
|
sta_info_recalc_tim(sta);
|
|
} else {
|
|
/*
|
|
* We need to release a frame that is buffered somewhere in the
|
|
* driver ... it'll have to handle that.
|
|
* Note that, as per the comment above, it'll also have to see
|
|
* if there is more than just one frame on the specific TID that
|
|
* we're releasing from, and it needs to set the more-data bit
|
|
* accordingly if we tell it that there's no more data. If we do
|
|
* tell it there's more data, then of course the more-data bit
|
|
* needs to be set anyway.
|
|
*/
|
|
drv_release_buffered_frames(local, sta, driver_release_tids,
|
|
n_frames, reason, more_data);
|
|
|
|
/*
|
|
* Note that we don't recalculate the TIM bit here as it would
|
|
* most likely have no effect at all unless the driver told us
|
|
* that the TID became empty before returning here from the
|
|
* release function.
|
|
* Either way, however, when the driver tells us that the TID
|
|
* became empty we'll do the TIM recalculation.
|
|
*/
|
|
}
|
|
}
|
|
|
|
void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
|
|
{
|
|
u8 ignore_for_response = sta->sta.uapsd_queues;
|
|
|
|
/*
|
|
* If all ACs are delivery-enabled then we should reply
|
|
* from any of them, if only some are enabled we reply
|
|
* only from the non-enabled ones.
|
|
*/
|
|
if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
|
|
ignore_for_response = 0;
|
|
|
|
ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
|
|
IEEE80211_FRAME_RELEASE_PSPOLL);
|
|
}
|
|
|
|
void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
|
|
{
|
|
int n_frames = sta->sta.max_sp;
|
|
u8 delivery_enabled = sta->sta.uapsd_queues;
|
|
|
|
/*
|
|
* If we ever grow support for TSPEC this might happen if
|
|
* the TSPEC update from hostapd comes in between a trigger
|
|
* frame setting WLAN_STA_UAPSD in the RX path and this
|
|
* actually getting called.
|
|
*/
|
|
if (!delivery_enabled)
|
|
return;
|
|
|
|
switch (sta->sta.max_sp) {
|
|
case 1:
|
|
n_frames = 2;
|
|
break;
|
|
case 2:
|
|
n_frames = 4;
|
|
break;
|
|
case 3:
|
|
n_frames = 6;
|
|
break;
|
|
case 0:
|
|
/* XXX: what is a good value? */
|
|
n_frames = 8;
|
|
break;
|
|
}
|
|
|
|
ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
|
|
IEEE80211_FRAME_RELEASE_UAPSD);
|
|
}
|
|
|
|
void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
|
|
struct ieee80211_sta *pubsta, bool block)
|
|
{
|
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
|
|
|
|
trace_api_sta_block_awake(sta->local, pubsta, block);
|
|
|
|
if (block)
|
|
set_sta_flag(sta, WLAN_STA_PS_DRIVER);
|
|
else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
|
|
ieee80211_queue_work(hw, &sta->drv_unblock_wk);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_sta_block_awake);
|
|
|
|
void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta)
|
|
{
|
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
|
|
struct ieee80211_local *local = sta->local;
|
|
struct sk_buff *skb;
|
|
struct skb_eosp_msg_data *data;
|
|
|
|
trace_api_eosp(local, pubsta);
|
|
|
|
skb = alloc_skb(0, GFP_ATOMIC);
|
|
if (!skb) {
|
|
/* too bad ... but race is better than loss */
|
|
clear_sta_flag(sta, WLAN_STA_SP);
|
|
return;
|
|
}
|
|
|
|
data = (void *)skb->cb;
|
|
memcpy(data->sta, pubsta->addr, ETH_ALEN);
|
|
memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN);
|
|
skb->pkt_type = IEEE80211_EOSP_MSG;
|
|
skb_queue_tail(&local->skb_queue, skb);
|
|
tasklet_schedule(&local->tasklet);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe);
|
|
|
|
void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
|
|
u8 tid, bool buffered)
|
|
{
|
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
|
|
|
|
if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
|
|
return;
|
|
|
|
if (buffered)
|
|
set_bit(tid, &sta->driver_buffered_tids);
|
|
else
|
|
clear_bit(tid, &sta->driver_buffered_tids);
|
|
|
|
sta_info_recalc_tim(sta);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_sta_set_buffered);
|
|
|
|
int sta_info_move_state(struct sta_info *sta,
|
|
enum ieee80211_sta_state new_state)
|
|
{
|
|
might_sleep();
|
|
|
|
if (sta->sta_state == new_state)
|
|
return 0;
|
|
|
|
/* check allowed transitions first */
|
|
|
|
switch (new_state) {
|
|
case IEEE80211_STA_NONE:
|
|
if (sta->sta_state != IEEE80211_STA_AUTH)
|
|
return -EINVAL;
|
|
break;
|
|
case IEEE80211_STA_AUTH:
|
|
if (sta->sta_state != IEEE80211_STA_NONE &&
|
|
sta->sta_state != IEEE80211_STA_ASSOC)
|
|
return -EINVAL;
|
|
break;
|
|
case IEEE80211_STA_ASSOC:
|
|
if (sta->sta_state != IEEE80211_STA_AUTH &&
|
|
sta->sta_state != IEEE80211_STA_AUTHORIZED)
|
|
return -EINVAL;
|
|
break;
|
|
case IEEE80211_STA_AUTHORIZED:
|
|
if (sta->sta_state != IEEE80211_STA_ASSOC)
|
|
return -EINVAL;
|
|
break;
|
|
default:
|
|
WARN(1, "invalid state %d", new_state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
|
|
sta->sta.addr, new_state);
|
|
|
|
/*
|
|
* notify the driver before the actual changes so it can
|
|
* fail the transition
|
|
*/
|
|
if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
|
|
int err = drv_sta_state(sta->local, sta->sdata, sta,
|
|
sta->sta_state, new_state);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/* reflect the change in all state variables */
|
|
|
|
switch (new_state) {
|
|
case IEEE80211_STA_NONE:
|
|
if (sta->sta_state == IEEE80211_STA_AUTH)
|
|
clear_bit(WLAN_STA_AUTH, &sta->_flags);
|
|
break;
|
|
case IEEE80211_STA_AUTH:
|
|
if (sta->sta_state == IEEE80211_STA_NONE)
|
|
set_bit(WLAN_STA_AUTH, &sta->_flags);
|
|
else if (sta->sta_state == IEEE80211_STA_ASSOC)
|
|
clear_bit(WLAN_STA_ASSOC, &sta->_flags);
|
|
break;
|
|
case IEEE80211_STA_ASSOC:
|
|
if (sta->sta_state == IEEE80211_STA_AUTH) {
|
|
set_bit(WLAN_STA_ASSOC, &sta->_flags);
|
|
} else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
|
|
if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
|
|
(sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
|
|
!sta->sdata->u.vlan.sta))
|
|
atomic_dec(&sta->sdata->bss->num_mcast_sta);
|
|
clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
|
|
}
|
|
break;
|
|
case IEEE80211_STA_AUTHORIZED:
|
|
if (sta->sta_state == IEEE80211_STA_ASSOC) {
|
|
if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
|
|
(sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
|
|
!sta->sdata->u.vlan.sta))
|
|
atomic_inc(&sta->sdata->bss->num_mcast_sta);
|
|
set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
sta->sta_state = new_state;
|
|
|
|
return 0;
|
|
}
|